ISSN:
1432-0789
Keywords:
Methidathion
;
Soil microflora
;
Enumeration of functional bacterial groups
;
Acetylene reduction assay
;
ARA
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary We studied the effects of the organophosphorus insecticide methidathion, at concentrations of 10, 50, 100, 200 and 300 μg g-1 in an agricultural soil, on fungi, total bacterial populations, aerobic N2-fixing bacteria, denitrifying bacteria, nitrifying bacteria (phases I and II), and nitrogenase activity (acetylene reduction assay). The presence of 10–300 μg g-1 of methidathion significantly increased fungal populations (colony-forming units). Denitrifying bacteria, aerobic N2-fixing bacteria and N2 fixation were significantly increased at concentrations of 50–300 μg g-1. The total number of bacteria increased significantly at concentrations of 100–300 μg g-1. Nitrifying bacteria decreased initially at concentrations of 300 μg g-1, but recovered rapidly to levels similar to those in the control soil without the insecticide.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00336275
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